React Advanced Form - Reactive props

RegistrationForm.jsx

<Input
  name="firstName"
  required={({ get }) => {
    // resolves any time "value" prop of "lastName" changes
    return !!get(['lastName', 'value']);
  }} />
  
<Input
  name="lastName"
  required={({ get }) => {
    // resolves any time "value" prop of "firstName" changes
    return !!get(['firstName', 'value']);
  }} />